Jakob schmid and jacques bachelut



" UNIT-En ST TES PATENT OFFICE' JAKOB s HMID AND JACQUES BA HELUT, OF BASLE, SWITZERLAND, ASSIGNORS TO THEYSOCIETY OF CHEMICAL INDUSTRY IN BASLE,

OF SAME PLACE.

BLUE BASIC DYE.

SPECIFICATION forming part of Letters Patent No. 525,627, dated September 4, 1894.

Application filed June 2. 1894. Serial No. 513,306. (Specimena) Patented in Germany December 10, 1892, No. 71,370; in France December 28, 1892, No. 226,762, and in England January 16,1893, No. 957.

To all whom it may concern: 7

Be it known that we, .TAKoB SOHMID, a subject of the Queen of Great Britain, and JAC Uns BACHELUT, a citizen of France, both residing at Basie, Switzerland, have invented new and useful Improvements in the Production of Blue Basic Coloring-Matters or Dye- Stuffs, (for which Letters Patent have been obtained in Germany, dated December 10, 1892, No. 71,370; in France, dated December 28, 1892, No. 226,7 62, and in England, dated January 16, 1893, No. 957,) of which the following is a specification.

Our invention relates to the manufacture of new and valuable blue basic coloring matters by condensation of two molecules of monoalkyl-orthotoluidin, with one molecule of dichlorbenzaldehyde, (described in the German Patent No. 32,238,) in presence of a condensing agent, such as, chlorhydric acid, or sulfuric acid, or chlorid of zinc, &c., and oxidation of the thus obtained leuco compounds of the general formula:

C H H (R represents alkyl-groups such as methyl or ethyl). The thus obtained coloring matters dye bright blue tints on wool and silk as well as on cotton mordanted with tannin and tar-.

pounds crystallize from alcohol and dissolve V easily in ether, benzene, warm alcohol and dilute mineral acids.

Example II. Oaa'idat'i0n.The leuco compound maybe convertd into the coloring matter according to the well known process used in the malachite green series, for example: Thirty parts of symmetrical dimethyl-diamido-ortho-ditolyl-dichlor-phenyl-methane are dissolved in forty parts of muriatic acid and fifteen hundred parts of water. To this solution the equivalent quantity of peroxid of lead in paste or another suitable oxidizing agent, is added. The coloring matter is immediately formed and precipitated in the usual way in the form of the double salt of zinc-chlorid and purified by redissolving in,

hot water. It is a glittering powder, which has a bronze luster and is diflicultly soluble in cold water, easily soluble in boiling water and alcohol with a bright blue coloration, insoluble in ether and benzine, easily soluble in concentrated sulfuric acid with a yellow coloration which turns green on addition of water; the aqueous solutions coagulate after cooling. The new dyestufi produces intense greenish-blue tints on wool, silk and cotton, the latter treated with tannin and tartar emetic. In an analogous manner a coloring matter with similar properties results from symmetrical diethyl diamido ortho ditolyl dich1or-phenylmethane.

What we claim as new, and desire to secure by Letters Patent, is-

The blue basic coloring matter whichcan be derived from the leuco compound of the general formula:

glittering powder, easily soluble in boiling water. and alcoholwith a bright blue coloration, insoluble in ether and benzene, easily .soluble in concentrated sulfuric acid with a yellow coloration which turns green on addiso tion of water; the aqueous solutions coagulate 1 after, cooling.

In testimony whereof we have hereunto set our hands in the vpresence of two subscribing witnesses.

JAKOB SCHMID. JACQUES BAOHELUT.

Witnesses:

, GEORGE GIFFoRD,

THEODORE H. ACHELER} 

